“In This Lovely Summertime” is a very popular song from Sweden about the beauties of summer. It is also a song often sung at weddings.
It is even in the Swedish LDS hynmal. I first heard it on my mission.
Here the original song is sung by a Swedish choir. This will give you an idea about how it should sound.
I adopted the words to sing about the mission and beauties of the coming Zion. It is still appropriate, considering it is now the summer of the world, awaiting the harvest at the end of the world as we know it, and it is appropriate as a wedding song, about the Bridegroom coming to meet His Bride. Here is the song with the new words in English.